Testing Primordial Non-Gaussianity with Galaxy bias

We investigate the capability of future measurements of the scale-dependence of galaxy bias to constrain two important features related to inflationary models which predict large primordial non-Gaussianity : the first one concerns the inequality valid for multi-field models of inflation between tNL, the amplitude of the collapsed limit of the four-point correlator of the primordial curvature perturbation and fNL, the amplitude of the squeezed limit of its three-point correlator; the second one deals with the scale-dependence of these two non-linearity parameters, fNL and tNL. We give forecasts of the precision with which Euclid-like experiments will be able to constrain these features